单项选择题

（） sex has its own physical and psychological characteristics．

A．Every
B．Each
C．Both
D．Neither

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单项选择题
He made it a rule never （） late.

A. get up
B. got up
C. to get up
D. gotten up
单项选择题
Had you worked harder．you（）a lot more．

A．will learn
B．will have learned
C．would learn
D．would have learned
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